ANDY HARMER / SCIENCE PHOTO LIBRARY ANDY HARMER / SCIENCE PHOTO LIBRARY
Air pollution. Cyclist wearing an air pollution mask and cycle helmet. The mask is designed to provide some protection against particulate pollution, such as unburnt carbon (soot). However it does not protect against gaseous pollutants such as carbon monoxide, ozone and sulphur and nitrogen oxides. Car exhaust fumes are the major air pollutant in cities. Heavy air pollution has been linked to a higher incidence of lung disease.
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